Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22071fb8cc605ad…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 14:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8fbf4f8174ad6c921bb85a89f4f8a11 SHA-1: 1faca3572e05981837b8c5148af09ba67a032663 SHA-256: a22071fb8cc605ad520e5f08e32911e4998adbe9dd2b9ec46f5d9773c6ca2f02
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains malformed streams and is flagged by ML classifiers and ClamAV as malicious, indicating it's likely an exploit or phishing document. It leverages a link farm on disposable hosting and includes a URI pointing to a raw IP address, suggesting an attempt to redirect the user to a malicious site or download a second-stage payload. No scripts were extracted, but the PDF structure and heuristics strongly suggest exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://shepardinteriordesign.com/rw/upload/file/kozoxorosuro.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/ribifesuzotibuloxemezopet.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210905_230352.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/94521741535.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/57674993665.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/98074345251.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/96496727458.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8e1584d---bolemezizujazijikavuwipul.pdfPDF link annotation
    • http://mnarch.it/userfiles/files/baxetexinoxesiwepu.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/dowedamabolevaluwas.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7d249205095334ddbf0f04c42b2cd33c/42710446728.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/rodexu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/23525100909.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5275e63522fb400b03f4e9f4f8a0cc8c/kiradowovaka.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906011235.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/pijemofawuzojaz.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/9654329029.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///3302052959.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/kuwejonoxemujalewanefax.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zixadukumi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/7003445947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dr+who+army+of+ghostsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB379 15800 bytes
SHA-256: 820c4433f77aa5be53604866ba2f076ea9988ea83035f5fa5dfc607f7eb17d8c
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10488 bytes
SHA-256: f586e854645960971fc255fb2d2e5453157cdb7dd160c927be56a97effc2c707
font_02_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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